codeplex.org: Our contribution agreement. This serves as a template for how companies or individuals may make intellectual property cntributions[sic] to the Foundation.
If Microsoft’s goal was to be at arm’s length, I would have recommended that they follow Eclipse’s or Apache’s model. Copyright assignment may provide benefits down the road, and can work for obviously independent organizations like the FSF, but in this case I’m concerned that this may prevent a successful and sustainable bootstrap.
Update: Sam Ramji is leaving Microsoft. I did’t see that one coming.